The highest tolerable dose of the combination of dasatinib, bevacizumab, and paclitaxel that was found will be given in combination with methylnaltrexone to up to 6 participants. If intolerable side effects occur, the next group of up to 6 participants will receive a lower dose of methylnaltrexone but the same dose of the combination of dasatinib, bevacizumab, and paclitaxel.